从数据库中读取一个图片并保存为一个图片文件

import java.sql.*;

import java.io.*;

public class WriteDB {

public static void main(String[] args) {

Connection conn=null;

String driver="com.mysql.jdbc.Driver";//驱动

String url="jdbc:mysql://127.0.0.1/test?useUnicode=true;characterEncoding=8859_1";// 数据库联接

try{

Class.forName(driver).newInstance();

conn=DriverManager.getConnection(url,"root","");

File file=new File(args[0]);

FileInputStream fis=new FileInputStream(file);

PreparedStatement pstmt=conn.prepareStatement(

"insert into picture(picture) values(?)");

int bytes=(int)file.length();

System.out.println(bytes);

pstmt.setBinaryStream(1,fis,bytes);//1为插入的参数1，2。。。fileInStream为插入的数据，bytes为字节长度

pstmt.executeUpdate();

conn.close();

fis.close();

}catch(Exception e){

System.out.println(e.getMessage());

}

}

}